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Income Taxes (Reconciliation of Provision for Income Taxes to U.S. Federal Income Tax Rate) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Tax Disclosure [Abstract]    
Statutory income tax rate 35.00% 35.00%
U.S. statutory rate at 35% $ 63 $ 48
Tax on foreign income (21) (14)
Tax contingencies 3 0
Valuation allowance 3 2
Other items, net (2) 2
Income tax provision $ 46 $ 38